Gold recovery from poor monazite leach residue - Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction - Metallurgist & Mineral Processing Engineer

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Gold recovery from poor monazite leach residue (2 replies)

7 years ago

Nikolay 7 years ago

Hello members, here is the tricky question. So I'm getting by gravity (shaking table etc) monazite concentrate with 20-30% TREO and 5-10 g/t Au. Particles size is about -0,5+0,05 mm. It is very convenient to get only one collective concentrate because of higher recoveries of both (Au and REE). After monazite leaching I have gold bearing residue in amount of 0,5-1,0 tph only. And it still contains 7-12 g/t gold! What could be the best solution to recover it most "economically"?

babygenius76

7 years ago

babygenius76 7 years ago

Nikolay, what method are you using to leach the monazite? Is the monazite/gold in alluvial or hard rock form? If it's hard rock, what is the primary gaunge (other than phosphate). It is also unclear to me exactly which minerals you want to produce for sale. Is it both the monazite and the gold separately? Or just the gold?

Nikolay

7 years ago

Nikolay 7 years ago

Hi, thanks for response! My concentrate is from waste of alluvial gold placer. The goal is to produce individual REO and Dore bar. We crack monazite by sulphatisation with water leaching, gold remains in residue. Throughput by concentrate approx. 1-2 tph. Any suggestion to cheapest way of gold recovery (no less than 95%)?

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